a nation and the world mourns the loss of iconic statesman nelson mandela, south africa will hold a week long celebration of life ahead of his official funeral service. >> world leaders, including president obama, are in attendance at the memorial service. let's go live to david mckenzie who is live in johannesburg, south africa with more on the memorial today. david? >> it has been a really powerful and day of celebration. thousands of people streamed into this stadium. he came out of a prison end-1990. this prose a democratic transition. he just wrapped up speaking, the president. he stated that nelson mandela had a very personal connection to him. he also stated-that she received a warm welcome and celebrated from a george bush. it has been more like 8 celebration. there have been many people who have been deeply touched by nelson mandela. they hope that his legacy lives on. >> i understand that the ceremony started late due to a training. how was the crowd? i heard that there were stumbling at some point. >> they had reported that there were people who was a boy in the current presid